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Charcoal Furnace Filter

charcoal furnace filter

charcoal furnace filter - Honeywell RTH2520B

Honeywell RTH2520B Decor 7-Day Programmable Thermostat

Honeywell RTH2520B  Decor 7-Day Programmable Thermostat

Decorator digital heat cool thermostat. 7 day programming with 4 periods per day. For use with gas, oil, or electric furnaces and AC, single stage heating and cooling or milivolt systems. Large easy to read display with backlight that shows set point, temperature, and program information. Includes 3 interchangeable faceplates to enhance decor (charcoal, taupe, titanium). Early start function ensures preprogrammed temperature is reached by desired time. Easy access battery compartment. Filter change indicator. Advanced temperature control ensures total comfort by minimizing temperature swings and is accurate to + 1 F. of set point. ENERGY STAR rated.

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Charlcotte Blast Furnace for Iron in Shropshire

Charlcotte Blast Furnace for Iron in Shropshire

This furnace is at Charlcotte, near Bridgnorth, Shropshire, England, UK. Its UK OS Grid Reference is SO638860.

In this formerly forested area, charcoal, ironstone and limestone were simultaneously available, though cheap water transport was not. These materials were tipped into the top of the furnace in alternating layers and the molten crude iron product periodically tapped at the base of the furnace and cast into rough ingots called pigs. Any further processing, including casting, forging or cementation for steel, necessitated an expensive re-heat.

Blast furnaces were introduced to Britain in 1498, when they superseded a more primitive reduction furnace called a bloomery. A crucial feature of the blast furnace was forced ventilation with cold air through tuyeres at the base. This effected hot burning of the charcoal, chemical reduction of the ironstone, and a degree of metal refining. The power for the bellows came from a waterwheel on a small leat.

A complex pattern of leats and cinder hillocks remains beneath deciduous trees at this site and the six-meter high stone furnace is substantially intact.

The Charlcotte furnace exemplified many in the wooded marcherlands of pre-industrial Britain and was possibly erected sometime in the seventeenth century. It is first mentioned in documentation of 1712. It declined from 1770 and was blown-out in 1793, by which time the Shropshire Iron Industry had migrated to the East Shropshire Coalfield around the modern town of Telford where the modern coke-based industry and mass-industrialism generally engendered.

The capacity of charcoal furnaces was limited by the friability of charcoal ( as opposed to coal coke ) which necessitated the careful adding of stone in small increments. This and the accelerating inflation in the price of charcoal throughout the eighteenth century gave a powerful economic impetus to the growth of coalfield smelting, as did the frequent association of exposed coalfields with navigable waters.

Between 1733 and 1777 the Charlcotte furnace was operated by the Knight family. This family ran a complex of furnaces, forges and tinplate mills at nearby Bringewood Forge in Herefordshire where experts have identified vestigial remains of works abandoned in the first half of the nineteenth century.

Iron Furnace

Iron Furnace


This stone structure In Cumberland Gap, Tn. is all that remains of the 30 ft. tower and foundry that was originally built between 1813 and 1835. This foundry is considered one of the last examples of a cold-blast charcoal furnace. The foundry consisted of several buildings and a 30 ft. overshot wheel that drove the furnace. The "Iron Furnace" is now a part of the Cumberland Gap National Historical Park.

charcoal furnace filter

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